Mainz fans have expressed their anger towards Jürgen Klopp following his recent decision to join Red Bull and oversee its network of clubs. During a Bundesliga match against Leipzig, a team backed by Red Bull, supporters of Klopp's former club displayed banners criticizing the coach. One prominent banner, positioned behind one of the goals, read, “Have you forgotten everything we gave you?” This message referenced Klopp's emotional farewell speech when he departed from Mainz in 2008 after an 18-year tenure as both a player and coach. In the match, Mainz suffered a 2-0 defeat to Leipzig, while Leverkusen secured a victory against Frankfurt. The fans' discontent highlights the deep connection Klopp had with Mainz and their disappointment over his new association with a brand like Red Bull.